Merge pull request #1042 from primer/fix-underlinenav-in-safari

Fix UnderlineNav in Safari

Author: simurai

src/navigation/underline-nav.scss

@@ -18,6 +18,7 @@
   color: $text-gray;
   text-align: center;
   white-space: nowrap;
+  background-color: transparent;
   border: 0;
   // stylelint-disable-next-line primer/borders
   border-bottom: 2px $border-style transparent;